WO1993010426A1 - Temperature measuring apparatus - Google Patents

Temperature measuring apparatus Download PDF

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Publication number
WO1993010426A1
WO1993010426A1 PCT/GB1992/002131 GB9202131W WO9310426A1 WO 1993010426 A1 WO1993010426 A1 WO 1993010426A1 GB 9202131 W GB9202131 W GB 9202131W WO 9310426 A1 WO9310426 A1 WO 9310426A1
Authority
WO
WIPO (PCT)
Prior art keywords
radiation
source
wavelength
temperature
measuring apparatus
Prior art date
Application number
PCT/GB1992/002131
Other languages
French (fr)
Inventor
Gordon James Edwards
Original Assignee
Secretary Of State For Trade And Industry
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Secretary Of State For Trade And Industry filed Critical Secretary Of State For Trade And Industry
Publication of WO1993010426A1 publication Critical patent/WO1993010426A1/en

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
    • G01J5/02—Constructional details
    • G01J5/08—Optical arrangements
    • G01J5/0801—Means for wavelength selection or discrimination
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
    • G01J5/02—Constructional details
    • G01J5/08—Optical arrangements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
    • G01J5/02—Constructional details
    • G01J5/08—Optical arrangements
    • G01J5/0896—Optical arrangements using a light source, e.g. for illuminating a surface
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
    • G01J5/60—Radiation pyrometry, e.g. infrared or optical thermometry using determination of colour temperature

Definitions

  • This invention relates to temperature measuring apparatus.
  • the radiative power emitted by the hot body is related to both the emissivity and the temperature of the body. If the emissivity is known, then in principle a measurement of the amount of radiation is sufficient to establish the temperature. Other quantities are involved in the calculation but these are measurable.
  • the emissivity of the hot body is not known and it is not easily determined.
  • uncertainty related to the emissivity leads to a related uncertainty in the calculated temperature.
  • temperature measuring apparatus comprising a first source of radiation for radiating at a first wavelength which is sufficient to cause measurable heating of the surface of a body whose 3/10426 2
  • a second source of radiation for radiating at a second wavelength which is sufficient to cause easureable heating of the surface of the body
  • a first radiation detector which is sensitive to radiation at the first wavelength such that it is capable of detecting a change of temperature of the body due to radiation from the second source of radiation and which is such that it is capable of converting radiation from the body at the first wavelength into an electrical signal
  • a second radiation detector which is sensitive to radiation at the second wavelength such that it is capable of detecting a change in temperature of the body due to radiation from the first source of radiation and which is such that it is capable of converting radiation from the body at the second wavelength into an electrical signal
  • the first and the second wavelengths will be visible or infrared wavelengths but other wavelengths may be employed.
  • the temperature measuring apparatus operates on the theory that the temperature rise (T-, ) of the hot body caused by the first source of radiation at the first wavelength is proportional to the power of the source and the emissivity of the body at the wavelength of the source, ie
  • T ⁇ C 1 .e 1 .P 1
  • €- is the emissivity
  • P- is the power
  • C- is dependent on both the ambient temperature of the body and the wavelength, but not on the emissivity.
  • This temperature rise radiates thermally at all wavelengths in the usual manner of a hot body.
  • the amount of radiation at the second wavelength is proportional to the temperature rise T-, and the emissivity at the second wavelength, ie
  • the ratio S-,/S p is independent of the emissivity and dependent only on the ratio of the source powers and other factors which are functions of the temperature of the body. It will thus be appreciated that the important features of the temperature measuring apparatus lie in (a) the selective heating of the body by two sources of radiation at two different wavelengths combined with (b) the use of two detectors tuned to the same wavelengths as the sources and arranged so that the detector tuned to the first wavelength detects the thermal radiation at that wavelength emanating from the hot spot generated by the source at the second wavelength, and vice versa for the other source and detector. It is this detector/source measurement combination that causes the appearance of the emissivity product for the two wavelengths to appear identically in the output of both detectors.
  • the temperature measuring apparatus will usually be one in which the first and the second wavelengths are each in a radiation bandwidth which is sufficiently narrow not to degrade the precision of the temperature measurement to below a required precision.
  • the first source of radiation and the second source of radiation may be such that they are each a pulse continuous or modulated source of radiation.
  • the first source of radiation and th second source of radiation are each a laser. Any other suitable and appropriate sources of radiation may however be employed.
  • the temperature measuring apparatus may include radiation detector means for measuring the radiation emitted from the first and the second sources.
  • the radiation detector means may be a third radiation detector which is for measuring the radiation emitted from both the first and the second radiation source Alternatively, the radiation detector means may be a third radiation detector which is for measuring the radiation emitted from the first source of radiation, and a fourth radiation detector which is for measuring the radiation emitted from the second source of radiation.
  • the first and the second radiation detectors ma?/ be in the form of a single combined radiation detector means, for example using a suitable arrangement of optics. 10426 6
  • Figure 1 shows first temperature measuring apparatus
  • Figure 2 shows second temperature measuring apparatus.
  • first temperature measuring apparatus 2 comprising a first source of radiation 4 for radiating at a first wavelength which is sufficient to cause measurable heating of the surface of a body ⁇ whose temperature is to be measured.
  • the apparatus 2 further comprises a second source of radiation 8 for radiating at a second wavelength which is sufficient to cause measurable heating of the surface of the body ⁇ .
  • the apparatus 2 further comprises a first radiation detector 10 which is sensitive to radiation at the first wavelength such that it is capable of detecting a change in temperature of the body ⁇ due to the second source of radiation 8.
  • the first radiation detector 10 is also such that it is capable of converting radiation from the body 6 at the first wavelength into an electrical signal.
  • the apparatus 2 further comprises a second radiation detector 12 which is sensitive to radiation at the second wavelength such that it is capable of detecting a change in the temperature of the body 6 due to the first source of radiation 4.
  • the second radiation detector 12 is also such that it is capable of converting radiation from the body 6 at the second wavelength into an electrical signal.
  • the apparatus 2 also comprises signal analyser/di means 13 fo measuring and comparing the electrical signals from the first and the second radiation detectors and for taking a ratio of these two signals such that the temperature of the surface of the body 6 can be calculated without a knowledge of the emissivity of the body ⁇ . More specifically, when the radiation from the first source of radiation 4 is incident on the hot body 6, then the amount of heating (ie the temperature rise) is related among other things to the amount of radiation (powe or energy) and is proportional to the emissivity of the bod at the first wavelength.
  • the change in the amount of radiation received at the second radiation detector 12 from the hot body 6 due to the heating effect on the body 6 of radiation from the first source of radiation 4 is then related to the surface temperature of the body 6, the radiative strength of the first source of radiation 4, and is also proportional to the product of the emissivities at the first and the second wavelengths.
  • the change in the amount of received radiation at the first radiation detector 10 is related to the surface temperature of the body ⁇ , the strength of the radiation from the second source of radiation 8, and is also /10426
  • the apparatus 2 enables the temperature of the surface of the body 6 to be calculated from a suitable set of measurements and without knowledge of the emissivity of the body, thereby overcoming a problem which has long existed in optical pyrometry.
  • the radiation beams from the first and the second sources of radiation 4, 8 are combined by a beam-splitter 14 and the combined and overlapping beams of radiation are focused by a lens 16 on the surface of the hot body 6.
  • the incident radiation from each of the first and the second sources of radiation 4, 8 induces a corres ⁇ ponding temperature rise in the surface of the body 6 as mentioned above,
  • a modulator 18 for the first source of radiation 4 and a modulator 20 for the second source of radiation are employed to help to determine the behaviour 0426 Q
  • the beam-splitter 14 allows sufficient portions of the radiation from the first and the second sources of radiation 4, 8 into radiation detector means in the form of a third radiation detector 22.
  • the third radiation detector 22 acts as a power monitor.
  • the function of the third radiation detector 22 is to measure the radiative power of each of the first and the second sources of radiation 4, 8.
  • the third radiation detector 22 (which measures the radiative power from both of the first and the second sources of radiation 4, 8) can be replaced by a third radiation detector for measuring just the radiative power from the first source of radiation 4, and a fourth radiation detector for measuring the radiative power just from the second source of radiation 8.
  • the apparatus 2 includes a pair of lenses 24, 26.
  • the thermal radiation generated by the first and the second sources of radiation 4, 8 and passed by the aperture 28 is directed by a lens 30 to a beam-splitter 32,
  • the beam-splitter 32 is a dichroic beam-splitter 32 which separates the thermal radiation into two spectral regions, one region of which contains radiation of the first wavelength and the other region of which contains radiation of the second wavelength.
  • Two narrow-band optical filters.34, 36 with sufficiently narrow bandwidths isolate the two wavelengths further and the power at each of these wavelengths is measured by the first and the second radiation detectors 10, 12 respectively.
  • FIG 2 there is shown second temperature measuring apparatus 2 in which similar parts as in Figure 1 have been given the same reference numerals for ease of comparison and understanding.
  • the lenses 16 and 24 in Figure 1 have been combined into a single lens structure enabling the beams fro the sources of radiation 4, 8 to have a common axis at the body 6, with the thermal radiation emitted by the body 6 and received by the detectors 10, 12.
  • the first and the second sources of radiation 4, 8 may give pulsed or continuous radiation.
  • the first and the second sources of radiation 4, 8 are preferably lasers but other sources of radiation may be employed.

Abstract

Temperature measuring apparatus (2) comprising a first source of radiation (4) for radiating at a first wavelength which is sufficient to cause measurable heating of the surface of a body (6) whose temperature is to be measured, a second source of radiation (8) for radiating at a second wavelength which is sufficient to cause measurable heating of the surface of the body (6), a first radiation detector (10) which is sensitive to radiation at the first wavelength, a second radiation detector (12) which is sensitive to radiation at the second wavelength, and means (13) for measuring and comparing electrical signals derived from the first and second radiation detectors (10, 12) and for taking a ratio of the two signals such that the temperature of the surface of the body (6) can be calculated without a knowledge of the emissivity of the body (6).

Description

TEMPERATURE MEASURING APPARATUS
This invention relates to temperature measuring apparatus.
It is well known to find the temperature of a hot body by measuring the amount of radiative power emitted. The radiative power emitted by the hot body is related to both the emissivity and the temperature of the body. If the emissivity is known, then in principle a measurement of the amount of radiation is sufficient to establish the temperature. Other quantities are involved in the calculation but these are measurable.
Generally, the emissivity of the hot body is not known and it is not easily determined. For an arbitrary hot body, uncertainty related to the emissivity leads to a related uncertainty in the calculated temperature.
It is an aim of the present invention to obviate or reduce the above mentioned problem.
Accordingly, in one non-limiting embodiment of the invention there is provided temperature measuring apparatus comprising a first source of radiation for radiating at a first wavelength which is sufficient to cause measurable heating of the surface of a body whose 3/10426 2
temperature is to be measured, a second source of radiation for radiating at a second wavelength which is sufficient to cause easureable heating of the surface of the body, a first radiation detector which is sensitive to radiation at the first wavelength such that it is capable of detecting a change of temperature of the body due to radiation from the second source of radiation and which is such that it is capable of converting radiation from the body at the first wavelength into an electrical signal, a second radiation detector which is sensitive to radiation at the second wavelength such that it is capable of detecting a change in temperature of the body due to radiation from the first source of radiation and which is such that it is capable of converting radiation from the body at the second wavelength into an electrical signal, and means for measuring and comparing the electrical signals of the first and the second radiation detectors and for taking a ratio of these two signals such that the temperature of the surface of the body can be calculated without a knowledge of the emissivity of the body.
Usually, the first and the second wavelengths will be visible or infrared wavelengths but other wavelengths may be employed. ,
The temperature measuring apparatus operates on the theory that the temperature rise (T-, ) of the hot body caused by the first source of radiation at the first wavelength is proportional to the power of the source and the emissivity of the body at the wavelength of the source, ie
Tχ = C1.e1.P1
where €-, is the emissivity, P-, is the power and C-, is dependent on both the ambient temperature of the body and the wavelength, but not on the emissivity.
This temperature rise radiates thermally at all wavelengths in the usual manner of a hot body. However, the amount of radiation at the second wavelength is proportional to the temperature rise T-, and the emissivity at the second wavelength, ie
S2 = D2*€2,T1 where €.^ is the emissivity at the second wavelengt and D is dependent on the temperature and wavelength but independent of the emissivity. By combining these two equations we get
By an analogous argument for the second source of radiation and the first radiation detector we get the equation /10426 ,,
Clearly, the ratio S-,/Sp is independent of the emissivity and dependent only on the ratio of the source powers and other factors which are functions of the temperature of the body. It will thus be appreciated that the important features of the temperature measuring apparatus lie in (a) the selective heating of the body by two sources of radiation at two different wavelengths combined with (b) the use of two detectors tuned to the same wavelengths as the sources and arranged so that the detector tuned to the first wavelength detects the thermal radiation at that wavelength emanating from the hot spot generated by the source at the second wavelength, and vice versa for the other source and detector. It is this detector/source measurement combination that causes the appearance of the emissivity product for the two wavelengths to appear identically in the output of both detectors. The elimination of the product by taking the ratio of the two signals is then easily accomplished. The temperature measuring apparatus will usually be one in which the first and the second wavelengths are each in a radiation bandwidth which is sufficiently narrow not to degrade the precision of the temperature measurement to below a required precision. 0
The first source of radiation and the second source of radiation may be such that they are each a pulse continuous or modulated source of radiation.
Preferably, the first source of radiation and th second source of radiation are each a laser. Any other suitable and appropriate sources of radiation may however be employed.
The temperature measuring apparatus may include radiation detector means for measuring the radiation emitted from the first and the second sources.
The radiation detector means may be a third radiation detector which is for measuring the radiation emitted from both the first and the second radiation source Alternatively, the radiation detector means may be a third radiation detector which is for measuring the radiation emitted from the first source of radiation, and a fourth radiation detector which is for measuring the radiation emitted from the second source of radiation.
If desired, the first and the second radiation detectors ma?/ be in the form of a single combined radiation detector means, for example using a suitable arrangement of optics. 10426 6
Embodiments of the invention will now be described solely by way of example and vit reference to the accompanying drawings in which:
Figure 1 shows first temperature measuring apparatus; and
Figure 2 shows second temperature measuring apparatus.
Referring to Figure 1, there is shown first temperature measuring apparatus 2 comprising a first source of radiation 4 for radiating at a first wavelength which is sufficient to cause measurable heating of the surface of a body β whose temperature is to be measured. The apparatus 2 further comprises a second source of radiation 8 for radiating at a second wavelength which is sufficient to cause measurable heating of the surface of the body β.
The apparatus 2 further comprises a first radiation detector 10 which is sensitive to radiation at the first wavelength such that it is capable of detecting a change in temperature of the body β due to the second source of radiation 8. The first radiation detector 10 is also such that it is capable of converting radiation from the body 6 at the first wavelength into an electrical signal. The apparatus 2 further comprises a second radiation detector 12 which is sensitive to radiation at the second wavelength such that it is capable of detecting a change in the temperature of the body 6 due to the first source of radiation 4. The second radiation detector 12 is also such that it is capable of converting radiation from the body 6 at the second wavelength into an electrical signal. The apparatus 2 also comprises signal analyser/di means 13 fo measuring and comparing the electrical signals from the first and the second radiation detectors and for taking a ratio of these two signals such that the temperature of the surface of the body 6 can be calculated without a knowledge of the emissivity of the body β. More specifically, when the radiation from the first source of radiation 4 is incident on the hot body 6, then the amount of heating (ie the temperature rise) is related among other things to the amount of radiation (powe or energy) and is proportional to the emissivity of the bod at the first wavelength. The change in the amount of radiation received at the second radiation detector 12 from the hot body 6 due to the heating effect on the body 6 of radiation from the first source of radiation 4 is then related to the surface temperature of the body 6, the radiative strength of the first source of radiation 4, and is also proportional to the product of the emissivities at the first and the second wavelengths. Similarly, the change in the amount of received radiation at the first radiation detector 10 is related to the surface temperature of the body β, the strength of the radiation from the second source of radiation 8, and is also /10426
- 8 -
proportional to the product of the emissivities at the first and the second wavelengths. By taking a ratio of these two signal changes, the effect due to emissivity disappears. The ratio is usually a function of the temperature, the relative strengths of the first and the second sources of radiation 4, 8 and a number of other perameters but, importantly, is independent of the emissivity of the hot body 6. Thus the apparatus 2 enables the temperature of the surface of the body 6 to be calculated from a suitable set of measurements and without knowledge of the emissivity of the body, thereby overcoming a problem which has long existed in optical pyrometry.
As shown, the radiation beams from the first and the second sources of radiation 4, 8 are combined by a beam-splitter 14 and the combined and overlapping beams of radiation are focused by a lens 16 on the surface of the hot body 6. The incident radiation from each of the first and the second sources of radiation 4, 8 induces a corres¬ ponding temperature rise in the surface of the body 6 as mentioned above, A modulator 18 for the first source of radiation 4 and a modulator 20 for the second source of radiation are employed to help to determine the behaviour 0426 Q
of the radiation from the first and the second sources of radiation 4, 8 for example their pulse shapes and modulation. This in turn helps to determine the shape of the temperature fluctuations at the body 6. The beam-splitter 14 allows sufficient portions of the radiation from the first and the second sources of radiation 4, 8 into radiation detector means in the form of a third radiation detector 22. The third radiation detector 22 acts as a power monitor. The function of the third radiation detector 22 is to measure the radiative power of each of the first and the second sources of radiation 4, 8. In a modification of the invention, the third radiation detector 22 (which measures the radiative power from both of the first and the second sources of radiation 4, 8) can be replaced by a third radiation detector for measuring just the radiative power from the first source of radiation 4, and a fourth radiation detector for measuring the radiative power just from the second source of radiation 8. The apparatus 2 includes a pair of lenses 24, 26.
These lenses act together with an aperture 28 such that the only radiation received by the first and second radiation detector 10, 12 comes from an area of the body 6 affected by the first and the second sources of radiation 4, 8. 10426 _ ±0 _
The thermal radiation generated by the first and the second sources of radiation 4, 8 and passed by the aperture 28 is directed by a lens 30 to a beam-splitter 32, The beam-splitter 32 is a dichroic beam-splitter 32 which separates the thermal radiation into two spectral regions, one region of which contains radiation of the first wavelength and the other region of which contains radiation of the second wavelength.
Two narrow-band optical filters.34, 36 with sufficiently narrow bandwidths isolate the two wavelengths further and the power at each of these wavelengths is measured by the first and the second radiation detectors 10, 12 respectively.
Referring now to Figure 2, there is shown second temperature measuring apparatus 2 in which similar parts as in Figure 1 have been given the same reference numerals for ease of comparison and understanding. In Figure 2, it will be seen that the lenses 16 and 24 in Figure 1 have been combined into a single lens structure enabling the beams fro the sources of radiation 4, 8 to have a common axis at the body 6, with the thermal radiation emitted by the body 6 and received by the detectors 10, 12.
It is to be appreciated that the embodiments of the invention described above with reference to the accompanying drawings have been given by way of example only 426 - 11 -
and that modifications may be effected. Thus, for example, the first and the second sources of radiation 4, 8 may give pulsed or continuous radiation. The first and the second sources of radiation 4, 8 are preferably lasers but other sources of radiation may be employed.

Claims

1. Temperature measuring apparatus comprising a first source of radiation for radiating a first wavelength which is sufficient to cause measurable heating of the surface of a body whose temperature is to be measured, a second source of radiation for radiating at a second wavelength which is sufficient to cause measurable heating of the surface of the body, a first radiation detector which is sensitive to radiation at the first wavelength such that it is capable of detecting a change in temperature of the body due to radiation from the second source of radiation and which is such that it is capable of converting radiation from the body at the first wavelength into an electrical signal, a second radiation detector which is sensitive to radiation at the second wavelength such that it is capable of detecting a change in temperature of the body due to radiation from the first source of radiation and which is such that it is capable of converting radiation from the body at the second wavelength into an electrical signal, and means for comparing the two electrical signals from the first and the second radiation detectors and for taking a ratio of these two signals such that the temperature of the surface of the body can be calculated without a knowledge of the emissivity of the body. 426 -_-•
2. Temperature measuring apparatus according to claim 1 in which the first source of radiation is for radiating at a first optical wavelength, and in which the second source of radiation is for radiating at a second optical wavelength.
3. Temperature measuring apparatus according to claim 1 or claim 2 in which the first and the second sources of radiation radiate at first and second wavelengt which are each in a radiation bandwidth which is sufficien narrow not to degrade the precision of the temperature measurement to below a required precision.
4. Temperature measuring apparatus according to any one of the preceding claims in which the first source of radiation and the second source of radiation are such that they are each a pulsed, continuous or modulated source of radiation.
5. Temperature measuring apparatus according to any one of the preceding claims in which the first source of radiation and the second source of radiation are each a laser. 10426 _ 1 _
6. Temperature measuring apparatus according to any one of the preceding claims and including radiation detector means for measuring the radiation emitted from the first and the second sources of radiation.
7. Temperature measuring apparatus according to claim 6 in which the radiation detector means is a third radiation detector which is for measuring the radiation emitted from both the first and the second sources of radiation.
8. Temperature measuring apparatus according to claim 6 in which the radiation detector means is constituted by a third radiation detector which is for measuring the radiation emitted from the first source of radiation, and a fourth radiation detector which is for measuring the radiation emitted from the second source of radiation.
9. Temperature measuring apparatus according to any one of the preceding claims in which the irst and 'the second radiation detectors are in the form of a single combined radiation detector means.
10. Temperature measuring apparatus substantially as herein described with reference to the accompanying drawings.
PCT/GB1992/002131 1991-11-22 1992-11-18 Temperature measuring apparatus WO1993010426A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB919124797A GB9124797D0 (en) 1991-11-22 1991-11-22 Temperature measuring apparatus
GB9124797.3 1991-11-22

Publications (1)

Publication Number Publication Date
WO1993010426A1 true WO1993010426A1 (en) 1993-05-27

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GB (1) GB9124797D0 (en)
WO (1) WO1993010426A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4331574A1 (en) * 1993-09-16 1995-03-23 Heimann Optoelectronics Gmbh Temperature compensated sensor module
NL1003196C2 (en) * 1996-05-23 1997-11-25 Kema Nv Device for contactless measurement of the temperature of moving bodies.
US6682216B1 (en) * 1999-12-16 2004-01-27 The Regents Of The University Of California Single-fiber multi-color pyrometry
EP2100554A1 (en) * 2008-03-15 2009-09-16 Horst-Wolfgang Spechtmeyer Method and device for measuring and creating communication with impulses of heat-emitting bodies
DE102010024378A1 (en) * 2010-06-11 2011-12-15 Dias Infrared Gmbh Compact 2-channel sensor for e.g. determining carbon monoxide content in gaseous mixtures, has spectral selective filter arranged in optical path, and radiation-sensitive element arranged immediately behind filter

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2602590A1 (en) * 1986-08-08 1988-02-12 Electricite De France METHOD OF MEASURING BODY TEMPERATURE BY OPTICAL DETECTION AND MODULE HEATING
US4818102A (en) * 1986-12-22 1989-04-04 United Technologies Corporation Active optical pyrometer
AT390326B (en) * 1987-04-23 1990-04-25 Plansee Metallwerk Method of measuring the temperature of an object by means of radiation pyrometry
WO1992012405A1 (en) * 1991-01-08 1992-07-23 Interuniversitair Micro Elektronica Centrum Vzw Method and device for measuring the temperature of an object and heating method

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2602590A1 (en) * 1986-08-08 1988-02-12 Electricite De France METHOD OF MEASURING BODY TEMPERATURE BY OPTICAL DETECTION AND MODULE HEATING
US4818102A (en) * 1986-12-22 1989-04-04 United Technologies Corporation Active optical pyrometer
AT390326B (en) * 1987-04-23 1990-04-25 Plansee Metallwerk Method of measuring the temperature of an object by means of radiation pyrometry
WO1992012405A1 (en) * 1991-01-08 1992-07-23 Interuniversitair Micro Elektronica Centrum Vzw Method and device for measuring the temperature of an object and heating method

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4331574A1 (en) * 1993-09-16 1995-03-23 Heimann Optoelectronics Gmbh Temperature compensated sensor module
US5826982A (en) * 1993-09-16 1998-10-27 Heimann Optoelectronics Gmbh Temperature sensing module
NL1003196C2 (en) * 1996-05-23 1997-11-25 Kema Nv Device for contactless measurement of the temperature of moving bodies.
WO1997044643A1 (en) * 1996-05-23 1997-11-27 N.V. Kema Apparatus for contactless measuring of the temperature of moving bodies
US6682216B1 (en) * 1999-12-16 2004-01-27 The Regents Of The University Of California Single-fiber multi-color pyrometry
EP2100554A1 (en) * 2008-03-15 2009-09-16 Horst-Wolfgang Spechtmeyer Method and device for measuring and creating communication with impulses of heat-emitting bodies
DE102010024378A1 (en) * 2010-06-11 2011-12-15 Dias Infrared Gmbh Compact 2-channel sensor for e.g. determining carbon monoxide content in gaseous mixtures, has spectral selective filter arranged in optical path, and radiation-sensitive element arranged immediately behind filter

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GB9124797D0 (en) 1992-01-15

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